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(No Model.) 2 Sheets-Sheet 1.

R. N. REDMAYNE.

APPARATUS FOR THE MANUFACTURE or PAPER PULP.

No. 483,870. Patented Oct. 4, 1892.

2 Sheets-Sheet 2.

(No Model.)

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UNITED STATES PATENT OFFICE.

ROBERT NORMAN REDMAYNE, OF NEWCASTLE-ON-TYNE, ENGLAND.

APPARATUS FOR THE MANUFACTURE OF PAPER-PULP.

SPECIFICATION forming part of Letters Patent No. 483,870, dated October 4, 1892.

Application filed March 28, 1891. Serial No. 386.752. (No model.)

To all whom it may concern.-

Be it known that I, ROBERT NORMAN RED- MAYNE, a subjectof the Queen of Great Britain and Ireland, and a resident of Newcastleon-Tyne, county of Northumberland England, have invented certain Improvements in Apparatus for the Manufacture of Paper- Pulp, of which the following is a specification.

This invention has for its object to improve apparatus employed 'in the manufacture of paper-pulp; and it consists in the features of construction and the combination'or arrangement of devices hereinafter described and claimed, reference being made to the accompanying drawings, in which Figure 1 is a detail sectional view showing the discharge end of a pulp-boiler connected up and ready for discharging the contents thereof. Fig. 2 is a detail side elevation of the connections employed for uniting the pulp-boiler with the pulp-conducting pipe or tube. Fig. 3 is a detail side elevation showing the relative arrangement of the pulpboiler, the pulp-conducting pipe or tube, and the pulp-chest. Fig. 4 is a detail sectional view of a pulp-reducing section to be inserted into the pulp-conducting pipe or tube, and Fig. 5 is a plan view of the same.

In order to enable those skilled in the art to make and use my invention, I will now describe the same in detail, referring to the drawings, wherein The letter a indicates a rotating pulp-boiler provided at its discharge-mouth with a ringcasting a, to which is attached the valve-casing 1), having the cock or valve 0. The boiler revolves in the usual way on trunnions at e. f is a sliding pipe or gland-piece fitted and working in a recess in the end of the curved pulp-conducting pipe or tube f. The latter may be carried up, as indicated in Fig. 3, to the pulp-chest in the upper part of the building to discharge thereinto. When the pulp has been sufficiently treated in the boiler, the discharge end is brought and stopped opposite to the gland-piece f. The latter is then raised up in its socket bya lever or wedge in any convenient manner and bolted to the flange b of the cock-casing. The cock may then be opened by a handle at h, when the pressure of the steam in the boiler entering thereto through the trunnions rapidly discharges the Whole of the pulp through cockcasing, gland, and piping to the pulp-chest situated in an upper story of the building.

The gland-piece is with advantage leadlined and formed with a decided taper, as shown at f in Fig. 1. The contraction thus caused in the area of outlet for the pulp under discharge from the boiler has a valuable 6o effect in further reducing the pulp, which is then carried up with the steam and delivered into the pulp-chest in a condition for subsequent treatment far superior to the condition of pulp elevated or tranferred by labor from the blow-off pit, as heretofore.

I-Iitherto it has been necessary to pass the pulp from the pulp-chest to beating-engines for the fibers to be further beaten out prior to their subsequent introduction to the knotting-machines. By my invention the action of the steam on the pulp during its elevation in the pipe or tube f materially improves its quality for subsequent treatment, and I find that by constructing the area of the piping as shown at f the beating-engines can be abolished and the pulp passed direct from the pulp-chest to the knotting-machines, whereby great economy is of course effected.

In practice the tapered internal construction of the gland-piece, acts to increase the velocity of the steam and pulp in transit therethrough, and this causes the particles of pulp to be suddenly thrown inward toward each other, so that they clash against and disintegrate one another, and thereby eifecta partial reduction.

A simple lever arrangement may be connected so as to facilitate the raising of the gland-piece for connection to the cock-casing, go as above described, or lugs may be cast on the gland, as shown in the drawings, whereby the gland may be easily wedged up to the desired position when required to be connectedfor discharging purposes.

As soon as the boiler is empty the cock may be closed and the gland disconnected and depressed somewhat in its socket to permit of the free revolution of the boiler.

Prior to the final delivery of the pulp into the pulp-chest such pulp passes through the reduction-section. (Shown in detail in Figs. 4 and 5 and in working position in Fig. 3.)

The reducing-section consists of a short length of reducing-pipe 1), having internal projections 19' arranged around its inner surface, so that when the pulp in process of be- 1ng blown up the pipe f comes into contact with these projections the fibers are still further reduced and improved in character to such an extent that their subsequent treatment prior to the introduction of the pulp to the machine is most materially simplified and facilitated.

Modifications of the device shown in Figs.

4 and 5 may be easily effected. Thus cross knives might be introduced to effect the reduction of the pulp; but such an arrangement would tend to unduly obstruct the area.

The precise shape of the internal projec- 4ions is not of great importance, the object being to present to the pulp in transit a reducing medium such as that described and vided with a valve-casing containinga Valve or cook, of a curved pulp-conducting pipe or tube having at its receiving extremity a vertically-sliding tube or gland provided with a tapering internal surface, and means for detachably connecting the sliding tube or gland with the valve-casing on the conical discharging end of the pulp-boiler, substantially as described.

2. The combination, with a rotating pulpboiler having a conical discharging end provided with a valve-casing containing a valve or cook, of a pulp-conducting pipe, a sliding gland-piece arranged on the pulp-conducting pipe and provided with a tapering internal surface, and a reducing-pipe section fitted in "juxtaposition to the pulp-chest, the several parts being arranged to, first, conveniently connect or disconnect the boiler with the pulpchest; second, to effect a partial reduction of the pulp by the agitation caused by the increased velocity in the contracted area of the gland piece, and, finally, to effect a thorough reduction of the pulp prior to its entrance into the pulp-chest, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ROBERT NORMAN REDMAYNE. Witnesses:

ALFRED MARSHALL CHAPMAN, T. F. REDMAYNE. 

